Update block description

[QuazChick]

• Updated the description of block states, removing the [EXPERIMENTAL] notice.
• Removed the following non-existent parameters: is_experimental, register_to_creative_menu.
• Made the types for valid state values stricter
  • All enum array items must be distinct and of the same type.
  • Enum arrays must not be longer than 16 items and must have at least 1 item.
  • Expanded documentation of integer ranges, adding the values property with its min and max parameters.